Have you done the FaceApp challenge yet? The app lets you add a filter to your face that makes you look like you're suddenly 80 years old. Simultaneously horrifying and hilarious, the challenge has gone viral, and if you have any kind of social media, you likely haven't been able to escape it over the last few days.

Celebrities have been taking part and getting in on the fun, too!

Click through the gallery to see our favourite celeb FaceApp challenges!